When positioning elements using CSS, it's possible to place them in a position that does not reflect their location in the source order. This can have unexpected side effects for keyboard-navigation users.
Icon fonts are a popular and effective method for providing scalable symbols that can be used to label controls and provide graphical information. The information provided by icons also needs to be available to people who can’t see them.
Captions allow people who can't hear a video's soundtrack to have access to a text version of the information provided in the audio.
If you decide to caption your own video content rather than outsource this job to a captioning service, make sure the captions provide an accurate and meaningful alternative to the audio. In particular, when writing captions for audio content in a video, make sure all the spoken content is available in captions, as well as indications of speaker switching (using ">>...
The most appropriate alternative text for an image depends very much on the context of the image in question. You must provide information for that image that takes into account its purpose and also the surrounding text on the page. The same image might need different alternative text depending on how it's used.... Read more about ✎ Technique: Writing alternative text
People differ in the way that they can (or like to) consume information, especially in educational contexts. Some people might prefer information provided in text, or video, or audio; and their accessibility needs can also influence their preferences.
But while accessibility for images often focuses on providing a text alternative for screen-reader users, we can also look at the issue from the other way around—providing a graphic alternative for text to make the underlying information or concept easier to...
Each image requires alternative text that is equivalent to the information it conveys, unless the image is purely decorative and provides no useful information. So you need to be careful about what value you give the alt attribute.